Perforated web



Dec. 23, 1941. w. s. CORBIN PERFORATED WEB 2 Sheets-Shet 2 Filed April1, 1939 nneuo Patented Dec. 23, 1941 PERFORATED WEB Wesley S. Corbin,Ridley Park, Pa., assignor to Scott Paper Company, Chester, Pa., a.corporation of Pennsylvania 7 Application April 1, 1939, Serial No.265,561

4 Claims.

In the manufacture of toilet and towel papers in roll form, it iscustomary to provide the continuous strip of paper which forms the rollwith transverse lines of perforations to thereby facilivention, Iprovide at each longitudinal side of the recess a blade 5, said bladesbeing secured by screws 6 to the cylinder, and having at'their outeredges and as best shown in Fig. 2 a longitate the separation from thestrip of sections or tudinal series of small teeth 1 which projectindividual sheets of predetermined size. The slightly beyond theperipheral surface of the cylcharacter of perforation heretoforeemployed is inder and penetrate the paper web 2, see Fig. 1. not highlyefficient in the function of establish- Coacting with the cylinder l isa member 8 ing a line along which the paper will readily which ismounted for rotation upon a shaft 9, separate, and a principal object ofthis invention this shaft paralleling the shaft 3 of the cylinder.

is to provide an improved and more highly eflicient form of perforationwhich while maintaining the strip intact under all normal conditionswill yet provide lines of rupture on which the individual sections or'sheets may be separated easily and efficiently. Another object of theinvention is to provide a novel form of perforation as set forth abovewhich'will utilize to advantage that property of the paper whichcreates'a tendency in the strip to tear more readily in the longitudinalthan in the transverse direction.

Still another object of the invention is to provide a novel form ofperforation which as each section of the paper is torn away will affordat The member 8 is axially coextensive with the cylinder and carries atits outer edge and secured thereto by bolts H a perforating head I2.

As shown in Fig. 2, the head I2 is provided with slots l3 for receptionof the said bolts II for radial adjustment. The perforating head [2 theterminal end of the roll a clearly defined and highlyornamentallace-like appearance.

A further object'of the invention is to provide an improved mechanismfor producing the aforesaid perforations with the required accuracy anduniformity.

In the attached drawings:

' Figur 1 is a fragmentary, more or less diagrammatic, transversesectional view of the principal elements of a perforating machine madein accordance with my invention;

Fig. 2 is a section on the line 22, Fig. 1;

Fig. 3 is a section on the line 33, Fig. 1;

Fig. 4 is an enlarged fragmentary view showing the form of the novelperforating device;

Fig. 5 is a fragmentary enlargement showing the character of theperforation and the manner in which it functions in the sheet-separatingoperation;

Fig. 6 is an enlarged fragmentary view showing a modified form ofperforating device;

Fig. 7 is an enlarged fragmentary view showing the character ofperforation produced by the device shown in Fig. 6, and

Fig. 8 is a view corresponding to Fig. 7 show.- ing the paper sheetpartially separated along the perforated line. 7

. With reference to Fig. l, the perforating mechanism thereinillustrated consists of a rotary cylinder l on which travels thecontinuous paper strip or Web 2 which forms the roll. The cylinder ismounted upon a shaft 3 and rotates in the direction indicated by thearrow. The cylinder has in its periphery one or more axially extendingrecesses 4, and in accordance with the incomprises in the presentinstance two blades l4 and I5 which are held in spaced parallel relationby an intervening spacer plate l6, and the outer edge of each of theblades M and I5 is provided with a series of pointed teeth, H and [8respectively, the forms of which are best shown in Fig. 4. The member 8is rotated in synchronism with the cylinder l' and is so relativelyarranged with respect to the cylinder that the outer edges of the bladesI4 and I5 enter the recess or recesses 4 of the cylinder, as shown inFig. 1. In the operation of this mechanism, the paper web 2 traveling onthe face of the cylinder 1 is penetrated by the points of the teeth I!and I8 to form in the latter two closely adjoining series of angularincisions, as shown in Fig. 3, the two series or rows of incisionsformed respectively by the blades l4 and I5 being designated by thereference numerals l9 and 2I. It will be noted that the teeth l1 and [8of the blades I l and I5 are laterally relatively offset so that theincisions l9 and 2| are staggered or interspersed with respect to eachother.

It will be apparent that as the blades l4 and I5 contact the paper web 2they exert a certain amount of side thrust tending to displace the webdownwardly into the recess 4. This tendency-of the paper to sag orstretch under the action of the blades is. prevented by theaforedescribed blades 5, 5, the upper toothed edges of which penetratethe web at the opposite sides of the recess and function to hold theintervening portion of the web at the top of the recess 4 in tautcondition. Since the blades 5 prevent any longitudinal displacement ofthe web and retain the web taut in the immediate area engaged by theteeth of the blades M and [5, the incisions l9 and 2i are cleanly cutand uniformly spaced, and the device thus makes possible accurateformation in the paper of the two closely adjoining lines of incisions.H .7

It will be noted by reference to Fig. 5 that the incisions l9 and 2! ofthe two series are in more or less overlapping relation in the directionlonleast resistance to tear. It will be noted further that the distancebetween the proximate ends of the V-shaped incisions 2i and the sides.of the correspondingly shaped incisions L9 in the directionlongitudinally of the sheet is relative- 1y small, and it is at thesepoints that the paper ruptures when the one section is pulled :away fromthe adjoining section. This is clearly shown in Fig. 5. Thus theindividual sections or sheets defined by the lines of incision areconnected together at a number of small juncture areas extending inseries transversely of the strip, and each of these areas lieslongitudinally .of the paper web, or substantially so, between twoclosely adjoining incisions. Also'by reason of the staggered relation ofthe incisions, the latter establish lines of connection between eachadjoining pair of the juncture areas, and since "each juncture area isthus connected to the immediately adjoining areas by the respectiveincisions, it will be apparent that in separating the individual sheetsrupture of the web occurs only within said juncture areas andlongitudinally of the sheet.

It will be noted that when the sections of the sheet are separated asdescribed along the lines of incisions, the edges of the sheets at theline of separation are left with a highly ornamental and symmetricalpattern, as indicated at 22 in Fig. 5. This ornamental appearance at theedge of the residual portion of the web is accen- 'tuated and enhancedby the line of perforations or indentations '23 whichare formed in thesheet by the teeth of the sheet-retaining b1a'des5.

In the 'aforedescribed embodiment of my invention, the teeth I! and I8of the blades f4 and 15 are caused to penetrate the'paper to an extentafiording two clearly defined lines of V- shaped incisions, eachseparate incision of both series being'separate from each other and.from the incisions of the adjoining series. In the embodiment of myinvention shown in Figs. 6.- 7 and '8, the teeth H and I8 are caused topenetrate the sheet to an extent such that the "incisions of one seriesintersect the incisions of the other, and it is apparent that if bladesof the character of those shown in Figs. 1,2 and "4 are employed, thepaper strip would be completely divided "by these incisions into aplurality of sections. By modifying one of the blades, as shown in Fig.6, by cutting away portions of certain of the teeth, the continuity ofthe incision may be interrupted, see 'Fig. 7, to leave 7 the stripintact at a plurality of points along the lines of incision. With thisform of incision, the adjoining sections of the paper strip at oppositesides of the incision line are joined together at a relatively fewnumber of points, and "preferably these points of connection aresomewhat greater in extent than those in the previously'describedembodiment wherein the number of connecting points-is relatively great.In this'arrangement, however, when tensile force is placed upon thesheet, the latter will tend to tear along "the line of incision andbetween the terminal ends of the adjoining incisions in a directionlongitudinally of the sheet or in the direction of the grain, as in theembodiment previously described.

.same direction and being relatively arranged so that the apex of eachof the incisions of one row is directed into the space between the twoadjoining incisions of the other row, some at least of the incisions ofone row being non-intersecting with respect to the adjoining incisionsof the other row so as to leave a plurality of small area-sci uncutpaper extending in each instance between a terminal edge of an incisionof one row and .a side of an incision of the other row, and uniting saidseparable sections of the web.

-2. A paper or like web having therein two contiguous, laterally oflsetand separately formed rows of V-shaped incisions jointly defining oneedge of a separable section of said web, said incisions having theirapices all .pointing in the direction of the natural .grain of the paperand being relatively arranged so that the apex of each of the incisionsof one row is directed into the space between two adjoining incisions ofthe other row, some at least of the incisions of one row beingnon-intersecting with respect to the adjoining incisions of the otherrow so as to leave a plurality of small areas of uncut .paper extendingin each instance in the direction of said grain between a terminal endof an incision of one row and a side .of an incision of the other row,and uniting said separable sections of .the web.

3. A paper or like web having therein two contiguous, laterally offsetand separately formed rows of V-shaped incisions jointly defining oneedge of a separable section of said web, said incisions having theirapices all "pointing in the same direction and being relatively arrangedso that the apex of each of the incisions of one row is directed intothespace between .two adjoining incisions of the other row, theincisions of one row lying in proximity to but not intersecting theincisons of the other row so as to'leave a longitudinal series of smallareas of uncut paper extending in each instance between .a terminal endof an incision of one row and a side or an incision of the other row,and uniting .said separable sections of the web.

4. A paper or like web having therein two contiguous, laterally ofisetand separately formed rows of V-shaped incisions jointly .defining oneedge of a separable section of said web, said incisions havingtheirapices all pointing in the direction of the natural grain of thepaper and being relatively arranged so that the apex of each of theincisions of one row is directed into the space between two adjoiningincisions of the other row, the incisions of one row lying in proximityto but not intersecting the incisions of the other row so as to leave alongitudinal series of small areas of uncut paper extending in eachinstance in the direction .of said grain between a terminal end of.anincis'ion of one row and a side of an incision of the other row, anduniting said separable sections of the web..

' WESLEY S. CORBIN.

